-LRB- CNN -RRB- -- Rescuers were scheduled to resume their search Friday morning for survivors of a ferry that sank off the Tanzanian island of Zanzibar , killing 60 people and leaving more than 80 people unaccounted for , the Red Cross said .

As night fell Thursday , crews halted their search until the next morning , the Red Cross said .

The vessel with about 290 people aboard -- including 31 children -- capsized near Zanzibar on Wednesday , according to a spokesman for the agency 's office in Tanzania .

About 145 people have been found alive , and rescue operations are ongoing , said Raymond Kanyambo , a spokesman for the agency .

Rescuers search for bodies after Indian ferry disaster

Authorities intensified efforts Thursday by using army helicopters , government troops and boats .

Strong winds and rough waves , which officials blame for the capsizing , complicated ongoing rescue efforts , he said .

Ferries in the region often carry passengers not included in the manifest , making it hard to pinpoint the exact number of people aboard .

The ferry was traveling between the Tanzanian commercial capital of Dar es Salaam and Zanzibar , the Indian Ocean archipelago popular with tourists for its pristine sandy beaches .

Bangladesh ferry death toll rises to more than 100

Zanzibar is a semi-autonomous part of Tanzania .

The capsizing Wednesday is the latest such disaster in the popular tourist destination of Zanzibar in less than a year .

More than 200 people perished when a crowded ferry traveling between two islands of Zanzibar sank in September . In that incident , the ferry had a capacity of about 600 passengers , but was carrying more than 1,000 people , officials said at the time .

Tanzanian authorities charged five men with negligence in the September capsizing , including the owner of the ferry and the captain .

See video footage of September 's incident

Journalist Farouq Karim contributed to this report from Zanzibar . CNN 's Karen Smith , Said Samira , Faith Karimi and Michael Martinez also contributed .

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NEW : Death toll rises to 60 , with more than 80 people still unaccounted for

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Rescuers pluck 145 people from the choppy waters , Red Cross says

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The vessel had about 290 people aboard -- including 31 children , it says

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Ferries in the region often carry passengers not included in the manifest